/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.drools.workbench.services.verifier.plugin.client.api;

import java.util.HashSet;
import java.util.Set;

import org.uberfire.commons.validation.PortablePreconditions;
import org.jboss.errai.common.client.api.annotations.MapsTo;
import org.jboss.errai.common.client.api.annotations.Portable;

@Portable
public class FactTypes {

    private final  Set<FactType> factTypes;

    public FactTypes() {
        this( new HashSet<>() );
    }

    public FactTypes( @MapsTo("factTypes") final Set<FactType> factTypes ) {
        this.factTypes = PortablePreconditions.checkNotNull( "factTypes",
                                                             factTypes );
    }

    public FactType getFactType( final String factTypeName ) {
        for ( final FactType factType : factTypes ) {
            if ( factType.getName()
                    .equals( factTypeName ) ) {
                return factType;
            }
        }

        return null;
    }

    public Set<FactType> getFactTypes() {
        return factTypes;
    }

    public String getFieldType( final String factTypeName,
                                final String fieldName ) {

        PortablePreconditions.checkNotNull( "factTypeName",
                                            factTypeName );
        PortablePreconditions.checkNotNull( "fieldName",
                                            fieldName );

        final FactType factType = getFactType( factTypeName );
        if ( factType == null ) {
            return null;
        }

        for ( final Field field : factType.getFields() ) {
            if ( field.getFieldName()
                    .equals( fieldName ) ) {
                return field.getType();
            }
        }

        return null;
    }


    @Override
    public String toString() {

        StringBuilder builder = new StringBuilder();

        for ( final FactType key : factTypes ) {
            builder.append( key.getName() );
            builder.append( "{" );

            for ( final Field field : key.getFields() ) {
                builder.append( field.toString() );
                builder.append( ", " );
            }
            builder.append( "}" );

        }

        return builder.toString();
    }

    public void add( final FactType factType ) {
        factTypes.add( factType );
    }

    @Portable
    public static class FactType {

        private final String name;

        private final Set<Field> fields;

        public FactType( @MapsTo("name") final String name,
                         @MapsTo("fields") final Set<Field> fields ) {
            this.name = name;
            this.fields = fields;
        }

        public String getName() {
            return name;
        }

        public Set<Field> getFields() {
            return fields;
        }
    }

    @Portable
    public static class Field {

        private final String fieldName;
        private final String type;

        public Field( @MapsTo("fieldName") final String fieldName,
                      @MapsTo("type") final String type ) {

            this.fieldName = fieldName;
            this.type = type;
        }

        public String getFieldName() {
            return fieldName;
        }

        public String getType() {
            return type;
        }

        @Override
        public String toString() {
            return "Field{" +
                    "fieldName='" + fieldName + '\'' +
                    ", type='" + type + '\'' +
                    '}';
        }
    }
}
